The results of recent research suggests that ancient, or pre-historic, builders of the monumental structures found in such diverse places as Ireland, Malta, southern Turkey and Peru all have a peculiarly common characteristic – they may have been specially designed to conduct and manipulate sound to produce certain sensory effects

Source: Ancient Builders Created Monumental Structures That Altered Sound And Mind – Say Researchers | Ancient Knowledge

As much as loathe articles where it seems assumed that our ancestors were imbeciles not capable of the level of complex reasoning that modern humans are, this is kind of cool.